Masked killed via 'Lethal_Doors' are glitched.

[Roobotics]

When a mask dies via the ship's doors, it leaves behind a bugged mask that you can pick up infinite copies from, until leaving the moon then landing again. (unsure if landing again is needed to fix it, but they fall backwards when they die, so the mask usually ends up just outside the ship door.)

Killing them via other mods like 'fairAI' mines or turret, doesn't cause this bugged-mask issue to happen.